bbs02 stops working when cold

T

travisraw

1 µW

Joined

Feb 17, 2020

Messages

2

• Feb 17, 2020

• #1

I am a new to ebike world. Built my first using a bbs02b with 48v hailong 13ah battery. 850c display on an old ccm 29er frame.
everything was perfect for first 100k. Now as soon as bike is cold. -7 c or so the throttle and the pas stop. as soon as i walk my bike home and it warms up it works perfect again? Please can some one offer me guidance?

 

T

travisraw

1 µW

Joined

Feb 17, 2020

Messages

2

• Feb 17, 2020

• #2

I am a new to ebike world. Built my first using a bbs02b with 48v hailong 13ah battery. 850c display on an old ccm 29er frame.
everything was perfect for first 100k. Now as soon as bike is cold. -7 c or so the throttle and the pas stop. as soon as i walk my bike home and it warms up it works perfect again? Please can some one offer me guidance?

 

DogDipstick

100 kW

Joined

Aug 19, 2018

Messages

1,845

Location

Fleetwood Pa

• Feb 17, 2020

• #3

Does the BMS control a LOWTEMP shutoff? Many will stop power on very low temps.

 

J

john61ct

1 TW

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Dec 18, 2018

Messages

8,758

• Feb 18, 2020

• #4

Feature not a bug

 

A

AngryBob

1 kW

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Jul 10, 2019

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383

• Mar 14, 2020

• #5

RTFM?

 

M

miro13car

100 kW

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Mar 26, 2007

Messages

1,905

Location

Calgary, Canada

• Mar 25, 2020

• #6

are you kidding me?
whatever ebike drive cut off at minus7C outside?
my ebike drive EPLUS works normally in minus 17C winter with no problems.
battery made of Nissan Leaf cells 11S do not suffer any damage at minus7C for sure.
hailong cells suffer at minus 7C ???!!!

 

J

john61ct

1 TW

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Dec 18, 2018

Messages

8,758

• Mar 25, 2020

• #7

Discharge is different

Fast charging that cold can murder the pack

 

markz

100 TW

Joined

Jan 9, 2014

Messages

12,179

Location

Canada and the USA

• Mar 25, 2020

• #8

Engineered failure for higher profits

miro13car said:

hailong cells suffer at minus 7C ???!!!

Click to expand...

 

docw009

1 MW

Joined

Aug 2, 2015

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2,436

Location

Illinois, Not far from Wayne's World.

• Mar 25, 2020

• #9

-7C is about 20F. Could be some batteries that shut off below 32F. Mine don't.

 

A

AngryBob

1 kW

Joined

Jul 10, 2019

Messages

383

• Mar 25, 2020

• #10

Since this is not likely to be a hardware fault, you could spend a few hours researching the BMS and controller you purchased, or go very carefully through all user-available settings for each and look for a temp cutoff you can modify.

Also you could look carefully for a temp sensor, they are pretty standard and easy to identify. Then, you can find out what happens if you simply disable it, if that fails then either rig a small heat source or a way to spoof it. Possibly as simple as replacing with a differently-calibrated sensor.

 

J

john61ct

1 TW

Joined

Dec 18, 2018

Messages

8,758

• Mar 25, 2020

• #11

Many BMS don't know from temperatures at. all.

 

A

AngryBob

1 kW

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Jul 10, 2019

Messages

383

• Mar 26, 2020

• #12

Some component on his system apparently does.

 

serious_sam

10 kW

Joined

Mar 5, 2017

Messages

594

Location

Australia

• Mar 28, 2020

• #13

Could be significant battery IR increase due to cold. Battery voltage drops under load. Either BMS or controller cuts out due to LVC. No problems with IR when battery temperature increases.